TW201843041A - Tissue paper and method for producing tissue paper product - Google Patents

Abstract

To provide a multi-ply tissue paper having "fluffy bulkiness" as well as excellent "softness" and "smoothness". The present invention provides a 4-ply tissue paper containing 6.1-12.6 mass% of glycerin and 1,3-propanediol, wherein the ratio of glycerin to 1,3-propanediol is 1:0.04-1:0.18, the basis weight of each layer is 10.6-14.3 g/m2, the paper thickness of the outer layer is 54-68 [mu]m, the MMD of the outer layer is 5.4-6.5, the paper thickness of the intermediate layer is 60-81 [mu]m, the MMD of the intermediate layer is 6.1-7.6, the paper thickness in 4-ply is 236-285 [mu]m, the longitudinal dry strength is 183-303 cN/25 mm, the transverse dry strength is 60-108 cN/25 mm, and the transverse wet tensile strength/the transverse dry tensile strength is 0.38-0.72.

Description

Method for manufacturing facial paper and facial paper products

The invention relates to a facial paper, in particular to a facial paper coated with a moisturizer.

Double-layered paper is the mainstream, but in recent years, the demand for multi-layered and thick paper with three or four layers has gradually increased. Such multi-layer papers are mostly classified as high-quality products that belong to higher product prices, and the tissue papers of such product groups are particularly required to have a "soft fluffy feeling" and "smooth surface." Degree "and" softness ".

In addition, in the case of a multilayer structure, if the basis weight (weight per unit area) of each layer is increased, the thickness of the paper can be easily increased by the multiplying effect of each layer, and a thick feeling and weight can be expressed. However, if the basis weight of each layer is increased in this way, softness and smoothness cannot be obtained. In addition, if the base paper is manufactured with a low density at the time of papermaking, although a soft and fluffy (large volume) base paper can be obtained, the voids between the fibers of the multilayer structure are easily destroyed during lamination and the like, so In some cases, the volume may decrease during the production process until the packing. In addition, since the density of the base paper is reduced, the surface fibers become thinner and the smoothness is also easily deteriorated. [Prior Art Literature] (Patent Literature)

Patent Document 1: Japanese Patent Application Laid-Open No. 2013-188921. Patent Document 2: Japanese Patent Application Laid-Open No. 5472586.

[Problems to be Solved by the Invention] In order to solve the problems to be solved by the present invention, the present invention provides a face paper, which is a four-layer paper, which can feel a "soft fluffy feeling" and "softness" and "smoothness" Degree "is also excellent. [Technical means to solve the problem]

The technical means to solve the above-mentioned problems to be solved are as follows. The first means to solve the above-mentioned problem is a face paper, which is a four-layer paper, which is characterized in that it contains glycerol and 1,3-propanediol in an amount of 6.1% by mass or more and 12.6% by mass or less, and The ratio of glycerol to 1,3-propanediol is 1: 0.04 or more and 1: 0.18 or less; the basis weight of each layer when the product is manufactured is 10.6 g / m ² or more and 14.3 g / m ² or less; the outer layer paper thickness is 54 μm Above and below 68 μm, the outer layer has an MMD of 5.4 and above and below 6.5; the middle layer has a paper thickness of 60 and above and 81 μm and the middle layer has an MMD of above 6.1 and below 7.6; the total thickness of the four layers is between 236 and 285 μm; and The dry strength of the face paper in the longitudinal direction is 183cN / 25mm or more and 303cN / 25mm or less, the dry strength in the horizontal direction is 60cN / 25mm and 108cN / 25mm or less, the wet tensile strength in the horizontal direction / dry pull in the horizontal direction The tensile strength is 0.38 or more and 0.72 or less.

A second method for solving the above-mentioned problem is a method for manufacturing a facial tissue product, which is characterized in that glycerol and 1,3-propanediol contain 6.1% by mass or more and 12.6% by mass or less in absolute terms. Method, the front and back sides of the laminated sheet are provided with a moisturizing medicinal solution; the laminated sheet is made into a four-layer structure formed by laminating an outer base paper and a middle base paper, and the dry paper force (dry strength) of the outer base paper in the longitudinal direction is 112 cN / 25mm or more and 139cN / 25mm or less, the horizontal drying paper force is 66cN / 25mm or more and 88cN / 25mm or less, and the intermediate base paper has a vertical paper drying force of 72cN / 25mm or more and 99cN / 25mm or less in the horizontal direction. The dry paper force is 51cN / 25mm or more and 73cN / 25mm or less, and the ratio of the dry paper force in the longitudinal direction of the middle-layer base paper to the dry paper force in the longitudinal direction of the outer-layer base paper is 0.64 to 0.71, and the middle-layer base paper is in the horizontal direction. The ratio of the dry paper force in the direction to the dry paper force in the horizontal direction of the outer base paper is 0.77 or more and 0.83 or less; the moisturizing medicinal solution contains glycerin and 1,3-propanediol. The mass ratio of oil to 1,3-propanediol is 1: 0.04 or more and 1: 0.18 or less.

The third method is the method for manufacturing a facial tissue product as described in the second method, further comprising: a first calendering step, which is performed before applying the aforementioned moisturizing liquid; a second calendering step, which is performed in The aforementioned moisturizing medicinal solution is applied after the application; and a folding processing step for performing folding by a rotary interfolder. [Effect of the invention]

As described above, according to the present invention, a face paper can be provided, which is a four-layer paper, which can feel a "soft fluffy feeling" and is also excellent in "softness" and "smoothness".

Hereinafter, embodiments of the present invention will be described. [Face paper] The face paper in this embodiment is a four-layer paper. In other words, four sheets of superimposed paper are formed. The four-layer paper in this embodiment contains glycerol and 1,3-propanediol of 6.1% by mass or more and 12.6% by mass or less, and the ratio of the glycerin to 1,3-propanediol is 1: 0.04 or more and 1: 0.18 or less.

The content of glycerol and 1,3-propanediol is the ratio in the paper, and is the ratio of the mass of glycerol and 1,3-propanediol to the mass of the tissue paper when absolutely dried. The term "absolute drying" refers to a state in which the tissue is dried to a constant weight under the conditions of a temperature of 65 ° C and a humidity of 10%. The ratio of glycerol to 1,3-propanediol is a mass ratio.

In addition, the tissue paper may contain a well-known auxiliary agent in addition to glycerin and 1,3-propanediol. Examples of the auxiliary agent include a moisturizing auxiliary component such as sorbitol; a hydrophilic polymer gelling agent, a surfactant, or a softness-improving agent for improving the retention of moisture in facial paper; a liquid Oily ingredients, such as paraffin, aid the performance of smoothness; other emulsifiers, preservatives, and defoamers are used to improve the stability and coating properties of moisturizers. In addition, the blending amount of ingredients such as moisturizing auxiliary ingredients and hydrophilic polymer gelling agents to improve moisture retention is set so as not to affect the "soft fluffy feeling", "softness", and "surface properties" unduly. "Smoothness". Specifically, it may be 1.0% by mass or less, preferably 0.6% by mass or less, and more preferably 0.5% by mass or less.

Here, the facial tissue in this embodiment contains glycerin and 1,3-propanediol, but generally, the medicinal solution previously used in facial tissue only uses glycerin as a main effect component. With the moisture absorption effect of glycerin, the moisture content in the paper is increased, and the moist feeling and softness are improved. However, conventional products containing glycerin only rely on the hygroscopic effect, so the drug application feelings such as "wetness", "humidity", and "stickiness" are also high. As a result, it may be difficult to feel "Smoothness" and "softness." The 1,3-propanediol in this embodiment can improve "softness" by blending it, and the surface will also have a refreshing touch. Therefore, the facial tissue of this embodiment can improve the "softness", "soft fluffy feeling", and "surface smoothness" by the effect of glycerin and the effect of 1,3-propanediol. In addition, this effect becomes significant when added to the following conditions: the layer structure of four layers; the composition of basis weight, paper thickness, MMD, and paper strength; and the content ratio of the glycerin and 1,3-propanediol ; And the mass ratio of glycerol to 1,3-propanediol.

The basis weight of each layer of the facial tissue of this embodiment is 10.6 g / m ² or more and 14.3 g / m ² or less. If the basis weight of each layer is within this range, "softness", "soft fluffy feeling", and "surface smoothness" will become significant. In particular, if the basis weight is high, the paper will become hard, while if the basis weight is low, the paper will tend to be soft. Therefore, the influence of the basis weight on "softness" is considered to be large. The basis weight is a value measured based on Japanese Industrial Standard JIS P 8124 (1998).

In addition, in the face paper of this embodiment, the outer layer has a paper thickness of 54 μm or more and 68 μm or less, and the MMD of the outer layer is 5.4 or more and 6.5 or less. Moreover, the so-called outer layer means each layer on two outer surfaces in a four-layer structure. However, the respective outer layers need not be the same constitution. In addition, if the paper thickness and MMD of the outer layer are within this range, the "softness", "soft fluffy feeling" and "surface smoothness" will become significant. The outer side of the outer layer constitutes a surface that directly contacts the skin.

The outer surface of the outer layer is coated with a medicinal solution, and the medicinal solution penetrates from the outer side to the inside. Therefore, with the moisturizing effect of the medicinal solution and the smooth physical properties of the medicinal solution, the effects of "softness" and "smoothness of the surface" can be exerted. In addition, because the outer layer contains a chemical solution, the paper can be smoothed by external pressure on the outer surface of the outer layer, such as calendering, and the chemical solution applied on the surface becomes uniform, making the surface slippery. Smooth, which can further express the "smoothness of the surface."

MMD is one of the indicators showing the smoothness of the surface. If it is within this range, a sufficient "smoothness" can be felt. Among them, the smoothness of the surface, which is measured based on MMD, is affected to some extent by the density of the fibers. Moreover, the density of the fibers is also related to the density of the paper, that is, the thickness of the paper and the basis weight. On the other hand, the density of paper affects "softness" and "softness". That is, it can be considered that in the outer layer, in addition to the basis weight, and the specific ranges of MMD and paper thickness, it will complicate the mechanical structure and the composition of pharmaceuticals such as glycerin. "The fluffy feeling" and "surface smoothness" will become significant.

On the other hand, in the face paper of this embodiment, the paper thickness of the middle layer is 60 μm or more and 81 μm or less, and the MMD of the middle layer is 6.1 or more and 7.6 or less. If the paper thickness and MMD of the middle layer are within this range, the "softness", "soft fluffy feeling" and "surface smoothness" will become significant.

Although the middle layer does not constitute a surface that directly contacts the skin, as mentioned above, the smoothness of the surface measured by MMD will be affected to some extent by the density of the fibers. Therefore, the density of the fibers of the middle layer is also related to the paper. The density is related to the paper thickness and basis weight. In addition, the surface characteristics of the middle layer will also affect the friction and integration with the outer layer. Therefore, MMD, basis weight and paper thickness will be related to "softness" and "softness". That is, it can be considered that for the middle layer, in addition to the basis weight, and within a specific range by MMD and paper thickness, the mechanical components and the composition of pharmaceuticals such as glycerin will be complicatedly affected, so "softness", "softness" "The fluffy feeling" and "surface smoothness" will become significant.

In particular, the facial tissue of this embodiment tends to have a slightly thicker middle layer than an outer layer. Compared with the outer layer, the medicinal liquid content in the middle layer has a lower tendency. There may be cases where the liquid medicine is not contained. Therefore, the influence of the middle layer on the moisturizing effect of the medicinal solution is small, and the damage in the thickness direction due to external pressure such as calendering is also small. For example, when used as a laminated structure, the density of the middle-layer base paper can be kept low even after two calendering treatments. Therefore, an effect such as a soft fluffy feeling can be expressed. In addition, it can be considered that the difference in the thickness of the paper between the outer layer and the middle layer, the density difference caused by the difference in paper thickness, and the difference in moisture content caused by the density difference will significantly improve the functionality. effect.

Moreover, the paper thickness of the outer layer and the middle layer is under the conditions of Japanese Industrial Standard JIS P 8111 (1998). After the test piece is fully adjusted for humidity, a dial thickness gauge (dial thickness gauge, Thickness measuring device) "PEACOCK G type" (manufactured by Ozaki Seisakusho). The specific steps are as follows: first confirm that there is no residue or dust between the plunger and the measuring table, then lower the plunger to the measuring table, and make the scale of the aforementioned needle plate thickness gauge correct and move to coincide with the zero point, Then, the plunger was raised and the sample was placed on the test bench, and then the plunger was slowly lowered and the measured value at this time was read. At the time of measurement, it should be noted that the terminals of the plunger made of metal (a circular plane with a diameter of 10 mm) were carried out so as to be perpendicular to the plane of the paper. The load at the time of the paper thickness measurement was about 70 gf. The paper thickness is the average of the measured values, and the measured values are obtained by performing the measurement 10 times by changing the location. The test piece was taken by separating four layers into layers.

MMD (variation of average friction coefficient (average deviation of friction coefficient)) is a value indicating the degree of variation and an index of smoothness, and the variation is a degree of variation from the average friction coefficient. The smaller the value, the smoother it is. The measurement was performed using a friction sensor KES-SE manufactured by Kato Tech Co., Ltd. or another similar model. The measurement method, as shown in Fig. 1, is performed according to the following method: The contact surface of the friction block is brought into contact with a tension of 20 g / cm in a specific direction at a contact pressure of 25 g. The surface of the sample was measured, and at a speed of 0.1 cm / sec, it was moved about 2 cm in the same direction as the direction to which tension was applied. In addition, the value obtained by dividing the friction coefficient by the friction distance (moving distance = 2 cm) is the MMD. In addition, the friction block is a 10mm square piano wire sensor as a standard accessory. This friction block is formed by adjoining 20 piano wires P having a diameter of 0.5 mm, and has a contact surface, which is formed so that both the length and the width become 10 mm. The contact surface is a portion having a unit bulge, and the unit bulge is formed by 20 piano wires P (curvature radius 0.25 mm) at the front end. The MMD was measured 10 times for each surface and the average value was set. In addition, the test piece was operated in the same manner as the paper thickness, and four layers were separated into each layer and taken. The MMD of the outer layer was measured on the outer side that was in direct contact with the skin among the four layers. The measurement was performed 5 times in the vertical direction and the horizontal direction, and the average value of the measured values in total 10 times was set to MMD. The MMD of the middle layer is set as the average of the front and back sides. The measurement was performed 5 times for the front and back sides in the vertical direction and the horizontal direction respectively, and the average value of the measurement values in total 20 times was set to MMD.

On the other hand, in the facial tissue of this embodiment, the total thickness of the four layers is 236 μm or more and 285 μm or less. With a multilayer structure like four layers, the thickness of the paper is particularly prone to affect "softness" and "softness." If the thickness of the tissue paper in this embodiment is within this range, the "softness", "soft fluffy feeling", and "surface smoothness" will become significant. In addition, the total paper thickness of the four layers is measured in the same manner as the method for measuring the paper thickness of each layer described above without peeling the layers.

On the other hand, the facial tissue of this embodiment has a dry strength in the longitudinal direction of 183 cN / 25 mm or more and 303 cN / 25 mm or less. If the dryness in the longitudinal direction is within this range, the "softness", "soft fluffy feeling", and "surface smoothness" will become significant. In addition, it is within a sufficient range of durability.

The dry strength in the horizontal direction is 60 cN / 25 mm or more and 108 cN / 25 mm or less. If the dryness in the horizontal direction is within this range, the "softness", "soft fluffy feeling", and "surface smoothness" become significant. In addition, it is within a sufficient range of durability. Furthermore, although it has not yet been determined, the "dry tensile strength in the horizontal direction" affects the overall "tactile" functionality rather than individual functionality such as "softness" and "softness." When the subjects were asked to freely touch the sample, the comprehensive evaluation criteria such as "tactile feeling" were used instead of the specific evaluation criteria such as "softness" and "soft feeling" to evaluate the quality of facial tissue. There is a certain degree of correlation between the evaluation of "touch" and "dry strength in the horizontal direction".

The facial tissue of this embodiment has a wet tensile strength in the horizontal direction / dry tensile strength in the horizontal direction of 0.38 or more and 0.72 or less. In addition, this value is a measurement value obtained by directly measuring four layers. By having such a difference in strength, the user will experience "toughness (strength and peace of mind)" when changing to a use state from dry to wet when blowing his nose or the like. Furthermore, it is difficult to feel the change in the strength of the paper in such a use situation, and it will affect the feeling of "smoothness" during use. The longitudinal direction of the paper, also referred to as the MD direction, is the conveyance direction during papermaking. The horizontal direction of the paper, also referred to as the CD direction, is a direction orthogonal to the conveying direction (MD direction) during papermaking.

The dry tensile strength of the face paper in the present invention is a value measured based on Japanese Industrial Standard JIS P 8113, and is a value measured by the following operation. The test piece was a test piece obtained by cutting a width (width) of 25 mm (± 0.5 mm) × a length of about 150 mm in the same direction in both the longitudinal and transverse directions of the face paper. Tissue paper is directly measured in a plurality of layers. The test machine is a load cell tensile tester TG-200N (model) manufactured by Minebea Co., Ltd., or a similar device equivalent to this model. The clamp interval was set to 100 mm and the stretching speed was set to 100 mm / minute. The measurement is performed according to the following steps: the two ends of the test piece are fixed to the fixture of the testing machine, a load is applied to the paper piece in the vertical direction, and then the indicated value (digital value) when the paper breaks is read. Five sets of samples (test pieces) were prepared for the longitudinal direction and the transverse direction of the face paper, and each of them was measured five times, and then the average of the measured values was taken as the dry tensile strength in each direction.

The wet tensile strength of the facial paper in the present invention is a value measured based on Japanese Industrial Standard JIS P 8135 (1998), and is a value measured by the following operation. The test piece was a test piece obtained by cutting a width (width) of 25 mm (± 0.5 mm) × a length of about 150 mm in the same direction in both the longitudinal and transverse directions of the face paper. When the tissue paper has a plurality of layers, the measurement is directly performed on the plurality of layers. The testing machine is a load cell tensile testing machine TG-200N (model) manufactured by Minebea Co., Ltd. or a similar machine equivalent to this model. The clamp interval was set to 100 mm and the stretching speed was set to 50 mm / minute. The test piece used a tissue paper which was subjected to a curing treatment in a dryer at 105 ° C. for 10 minutes. The measurement was performed according to the following steps: After fixing both ends of the test piece to the jig of the testing machine, using a flat brush soaked with water, horizontally applying water with a width of about 10 mm to the center of the test piece. Immediately apply a load to the paper sheet in the up and down direction, and then read the indicated value (digital value) when the paper breaks. Five sets of samples (test pieces) were prepared for the longitudinal direction and the transverse direction of the face paper, and each of them was measured five times, and then the average of the measured values was set as the wet tensile strength in each direction.

Adjustment of the dry tensile strength and the wet tensile strength can be performed by adding a dry paper strength enhancer or a wet paper strength enhancer to a paper stock or a wet paper. As a dry paper strength enhancer, starch, polyacrylamide, CMC (hydroxymethyl cellulose) or its salts, that is, sodium methyl methyl cellulose, calcium methyl methyl cellulose, zinc methyl methyl cellulose, etc. can be used. . As the wet paper strength enhancer, polyamidopolyamine epichlorohydrin resin, urea resin, acid colloid / melamine resin, heat-crosslinkable coating PAM (polypropyleneamidoamine), and the like can be used. In addition, when a dry paper strength enhancer is added inside, the amount of addition to the pulp slurry is about 1.0 kg / tonne or less of pulp. The wet paper strength enhancer is preferably a cationic paper strength enhancer, and the amount of the wet paper strength enhancer is about 5.0 to 20.0 kg per ton of pulp.

The fiber material constituting the tissue paper is pulp fiber, and is expected to be NBKP (needle-leaved tree bleached kraft pulp) and LBKP (broad-leaved tree bleached hardwood kraft) which can be used for the tissue paper. pulp), short fiber pulp). Although recycled pulp can be blended, since it is difficult to express the "softness" of recycled pulp, it is extremely desirable to consist of only NBKP and LBKP of virgin pulp. The blending ratio is NBKP: LBKP = 25: 75 ～ 40: 60 in terms of mass ratio. If it is within this range, it is possible to make a facial paper that is easy to feel the paper strength and "soft fluffy feel" required for blowing your nose, and that you can feel "softness" and "smoothness" significantly. .

On the other hand, the elongation in the longitudinal direction of the facial paper in this embodiment is desirably 10.1% or more and 12.3% or less. If the elongation is within this range, it becomes easy to express sufficient strength and usability when used on the occasion of blowing the nose. In addition, the elongation is also related to the surface characteristics of the tissue paper having a fine crepe on the surface, and it is easy to express the "smoothness" of the surface. The elongation means a value measured by a tensile test in accordance with Japanese Industrial Standard JIS P 8113 (1998). An example of the measurement device is "Universal Tensile Compression Tester TG-200N (Model)" manufactured by Minebea Corporation. The elongation can be adjusted by the crepe line rate of the base paper during papermaking.

[Manufacturing method of facial paper and facial paper products] The facial paper in the present embodiment and a product made by packaging the facial paper in a bundle or the like can be manufactured according to the following manufacturing steps. First, a paper-making device is used to take up a single-layer paper base paper that is made of paper and has a crepe line to form a primary original web roll. Then, four primary raw material rolls are set in a laminating facility also called a ply machine, and a single layer of continuous sheet is continuously sent out by each primary raw material roll to be laminated into four layers. It is slit and the like and wound up as a secondary raw material roll. Then, using this secondary raw material roll, a laminated bundle is formed in a folding apparatus or the like also referred to as an interfolder. Then, the laminated bundle is cut into an appropriate size and the like, and then packed in a carton or the like to make a facial tissue product. In a series of steps in the manufacturing step of manufacturing the tissue paper, or between the steps, a medicament imparting device is additionally provided, and a moisturizer containing glycerin and 1,3-propanediol can be imparted to the tissue paper base by external addition. liquid. In addition, the moisturizing chemical solution can be applied to the base paper, and it can be implemented from one side. However, from the viewpoint that the smoothness of both sides is easy to be uniform, it is desirable to use double-sided coating. In particular, the application of the moisturizing liquid medicine is particularly preferably carried out in a state of a laminated continuous sheet formed by laminating a base paper. Regarding workability, it is desirable to apply a medicinal solution to a continuous sheet in a laminated state because the strength of the entire layer is reduced less, and the moisturizing medicinal solution can be reliably applied to the two outer layers that are in contact with the skin.

The application of the moisturizing liquid medicine can be specifically carried out by assembling a roller transfer device such as a flexo press or a gravure printing machine in a layer production facility or a cross-folding machine, and spray coating. It is also possible to implement a chemical liquid coating device such as a cloth device, or to implement the device as a device different from a layer production device or a cross-folding machine.

For the moisturizing chemical, for example, an appropriate solvent such as water can be used to adjust glycerin, 1,3-propanediol, and an appropriate auxiliary agent to a viscosity corresponding to a coating method.

A staggered folding machine that performs folding processing can be a device that performs folding processing by using a multi-stand type, a stand type, or a folding plate also known as a folding plate, or it can also be called a rotary A device that performs folding processing using a pair of folding rolls. However, it is desirable to use a rotary staggered folding machine. When used as a tissue paper product with a multilayer structure of more than three layers, although a large number of layers can easily cause misalignment (offset) of each layer, compared to other equipment, the rotary staggered folding machine applies a continuous sheet. The tension is weak, so misalignment of each layer is not easy to occur, and the folding quality is also easy to be good. Therefore, it is particularly difficult to reduce the "soft feeling" during processing.

The facial tissue base paper used when manufacturing the facial tissue and its products in the present invention is desirably the following facial tissue base paper. For the outer base paper constituting the outer layer, it is desirable that the dry paper force in the longitudinal direction is 112 cN / 25 mm or more and 139 cN / 25 mm or less, and the dry paper force in the horizontal direction is 66 cN / 25 mm or more and 88 cN / 25 mm or less. In the middle-layer base paper, the dry paper force in the longitudinal direction is preferably 72 cN / 25 mm or more and 99 cN / 25 mm or less, and the dry paper force in the horizontal direction is 51 cN / 25 mm or more and 73 cN / 25 mm or less. Further, the crepe line ratio of the base paper is preferably 16 to 18% in the outer base paper and 14 to 16% in the middle base paper. Regarding the outer base paper and the middle base paper, in order to impart a difference in paper strength, it is only necessary to adjust the amount of paper strength agent added during papermaking, adjust the basis weight, and the paper thickness. In addition, the dry tensile strength and wet tensile strength of each base paper in the present invention are the same as the dry tensile strength of the above-mentioned face paper except that the test piece is a single-layer base paper made using papermaking equipment. The wet tensile strength of the facial paper was measured in the same manner.

When using these outer base papers and middle base papers, it is possible to form a laminated sheet with a four-layer structure and impart moisturizing liquid to the front and back sides of the four-layer structure. Outer layer.

In the four-layer laminated sheet, it is particularly preferable that the ratio of the dry paper force of the middle-layer base paper in the longitudinal direction to the dry paper force of the outer-layer base paper in the longitudinal direction is 0.64 or more and 0.71 or less, and the middle-layer base paper is in the horizontal direction. The ratio of the force to the dry paper force in the horizontal direction of the outer base paper is 0.77 or more and 0.83 or less. In addition, the two outer base papers and the two middle base papers do not need to have the same physical properties, but at this time, it is desirable that each outer layer and the two middle base papers still satisfy all the above conditions. In other words, any of the two middle-layer base papers may have the above-mentioned ratio to any one of the outer-layer base papers.

A four-layer laminated sheet is provided with a moisturizing medicinal solution such that glycerin and 1,3-propanediol contain 6.1% by mass or more and 12.6% by mass or less in absolute terms, the moisturizing solution contains glycerin and 1,3-propanediol, The mass ratio of glycerol to 1,3-propanediol is 1: 0.04 or more and 1: 0.18 or less. The term "absolute" refers to a state in which the produced facial paper is dried at a temperature of 65 ° C and a humidity of 10% until it becomes constant weight. The term “contained” refers to a ratio in paper, and is a ratio of the mass of glycerin and 1,3-propanediol to the mass of tissue paper. To set such a content ratio, for example, the ratio of glycerin and 1,3-propanediol to water in the moisturizing chemical liquid can be adjusted to 1: 5.44 to 1: 5.61, and the moisturizing chemical liquid is 7.5 mass of the original paper quality. It may be provided in a manner of not less than% and not more than 13.0% by mass.

However, if the glycerol and 1,3-propanediol are to be contained in an absolute amount of 6.1% by mass or more and 12.6% by mass or less, the method and the numerical range are not necessarily limited. Moreover, the mass ratio of glycerin to 1,3-propanediol of the moisturizing liquid can be maintained substantially when the product is absolutely dry. Moreover, the moisturizing medicinal solution may contain a well-known adjuvant other than glycerin and 1,3-propanediol as long as the effect of the present invention is not hindered. Its content is about 5% by mass or less in the medicinal solution based on the entire additive. Examples of the auxiliary agent include a moisturizing auxiliary component such as sorbitol; a hydrophilic polymer gelling agent, a surfactant, or a softness-improving agent for improving the retention of moisture in facial paper; a liquid Oily ingredients such as paraffin aid the performance of smoothness; other emulsifiers, preservatives, defoamers, etc. are used to improve the stability and coatability of moisturizers. In addition, the blending amounts of the moisturizing auxiliary ingredients and the hydrophilic polymer gelling agent to improve the moisture retention are set so as not to affect the "soft fluffy feeling", "softness", and "surface." "Smoothness". Specifically, it may be 1.0% by mass or less, preferably 0.6% by mass or less, and more preferably 0.5% by mass or less.

In the manufacturing method of the facial tissue product in this embodiment, the drying paper force of a product can be moderately reduced with respect to the drying paper force of each base paper. In addition, the drying paper force of the product is moderately reduced relative to the drying paper force of each base paper, and is reduced to a range of approximately 15.5% to 38.2% in the longitudinal direction and to approximately 52.8% or more in the horizontal direction. A range below 72.9%. In addition, the amount of water in the paper becomes constant by evapotranspiration, moisture absorption, and the like after the moisturizing chemical solution is applied. As a result, a "soft fluffy feeling" that can feel the physical properties and composition in the embodiment described above, and can also feel the "softness" and "smoothness" significantly.

Furthermore, especially when manufacturing the facial tissue of this embodiment, a rotary type folding machine can be used as the folding machine. In addition, it is desirable to perform calendering on the laminated sheet. By calendering the laminated sheet, the difference in paper thickness between the outer layer and the middle layer can be easily produced. Moreover, especially when folding processing is performed using a rotary staggered folding machine, it is desirable to implement it by providing a moisturizing chemical solution in the staggered folding machine. Furthermore, if the first calendering step is performed before the moisturizing chemical liquid is applied, and the second calendering step is performed after the moisturizing chemical liquid is applied, it is easy to obtain a "soft fluffy feeling" And can feel the "softness" and "smoothness" of the tissue paper.

Next, the effects of the facial paper in the present embodiment described above will be described in more detail with "Examples". [Example]

The tissue paper in the present invention and a tissue paper different from the present invention were used as samples, and "soft fluffy feeling", "softness", and "surface smoothness" were used as evaluation items to perform the following functional tests. . The physical properties, composition values, and the like of each sample were measured in accordance with the following. The physical properties and composition values of each sample, and the test results are shown in Tables 1 and 2 below.

[Basic weight] The measurement was performed in accordance with Japanese Industrial Standard JIS P 8124 (1998). [Paper Thickness] Under the conditions of Japanese Industrial Standard JIS P 8111 (1998), a dial thickness gauge (thickness gauge) "PEACOCK G" (manufactured by Ozaki Seisakusho) was used to perform the measurement according to the above-mentioned thickness measurement method. [Density] Calculated based on the total basis weight of the three layers (basic weight of the single layer × 3) and the paper thickness of the three layers. The unit is g / cm ³ and it is expressed to two decimal places. The paper thickness of the three layers can be carried out in the same manner as in the case where the paper thickness of each layer is measured without being peeled into the respective layers.

[Dry tensile strength] The tensile strength was measured in accordance with the Japanese Industrial Standard JIS P 8113 (1998). The test piece was a test piece obtained by cutting a width (width) of 25 mm (± 0.5 mm) × a length of about 150 mm in the same direction in both the longitudinal and transverse directions of the face paper. When the tissue paper has a plurality of layers, the measurement is directly performed on the plurality of layers. The testing machine was a load cell tensile testing machine TG-200N (model) manufactured by Minebea Corporation. The clamp interval is set to 100 mm. The measurement is performed according to the following steps: the two ends of the test piece are fixed to the jig of the testing machine, a load is applied to the paper piece in the vertical direction, and then the indicated value (digital value) when the paper breaks is read. The stretching speed was set to 100 mm / minute. Five sets of specimens (test pieces) were prepared for the longitudinal and transverse directions of the facial paper, and each of them was measured five times. The average value of the measured values was set to the dry tensile strength in each direction. Specification JIS P 8111 (1998)).

[Wet Tensile Strength] The tensile test was measured in accordance with the Japanese Industrial Standard JIS P 8135 (1998). The test piece was a test piece obtained by cutting the width and width of the face paper in a length direction of about 25 mm (± 0.5 mm) and a length of about 150 mm. When the tissue paper has a plurality of layers, the measurement is directly performed on the plurality of layers. The testing machine was a load cell tensile testing machine TG-200N (model) manufactured by Minebea Corporation. The clamp interval is set to 100 mm. The measurement was performed according to the following steps: After fixing both ends of the test piece to the jig of the testing machine, using a flat brush soaked with water, horizontally applying water with a width of about 10 mm to the center of the test piece, immediately after that, A load was applied to the paper sheet in the up-down direction, and then the indicated value (digital value) when the paper was broken was read. The test piece was made by performing a Curing Process in a dryer at 105 ° C. for 10 minutes. The stretching speed was set to 50 mm / minute. Five sets of samples (test pieces) were prepared for the longitudinal direction and the transverse direction of the face paper, and each of them was measured five times, and then the average of the measured values was set as the wet tensile strength in each direction.

[Elongation] Tensile test in accordance with Japanese Industrial Standard JIS P 8113 (1998), using a load cell tensile tester TG-200N (model) manufactured by Minebea Co., Ltd. and following the above-mentioned dry tensile strength test and measurement Steps to perform the measurement.

[Softness] The measurement was performed in accordance with the handle-O-meter method, which is based on the Japanese Industrial Standard JIS L 1096 E method. Here, the test piece was set to a size of 100 mm × 100 mm, and the clearance was performed at 5 mm. The measurement was performed 5 times in a vertical direction and a horizontal direction in a single layer, and then the average value of the total 10 times was expressed in the unit of cN / 100mm. Softness is one of the indicators of softness.

[MMD] The measurement was performed in accordance with the MMD measurement method described above. That is, the friction sensor KES-SE manufactured by Gado Technology Co., Ltd. was used, and a 10 mm square piano wire sensor of a standard accessory was used to measure MMD. The measurement conditions are implemented as follows: the sample is fixed in a state where a tension of 20 g / cm is applied in a specific direction, and the friction block is brought into contact with the surface of the measurement sample at a contact pressure of 25 g, while the The direction to which the tension was applied was approximately 2 cm at a speed of 0.1 cm / sec. A single layer was measured five times in the vertical direction and the horizontal direction, and the average value of the total ten times was expressed as a dimensionless unit. MMD is one of the indicators of smoothness.

[Content of glycerin and 1,3-propanediol] The content of glycerin and 1,3-propanediol is a ratio in paper, and the mass of glycerol and 1,3-propanediol relative to the mass of the sample at the time of absolute drying proportion. In the case of absolute drying, the tissue is dried to a constant weight under the conditions of a temperature of 65 ° C and a humidity of 10%.

[Sensory evaluation] 30 evaluators were used, and Comparative Example 1 was used as a reference sample, and compared with the reference sample, evaluation was performed for "soft fluffy feeling", "softness", and "surface smoothness" , "5" when you feel "very good", "4" when you feel "excellent", "3" when you feel "good or not", and "poor" when you feel The score is "2", and the score is "1" when "very bad" is felt, and the average score of each reviewer is calculated as the evaluation value.

Regarding the "comprehensive evaluation", it is evaluated as "5" when it is felt that "the touch is good and the willingness to buy is very high", and it is evaluated as "4" when it is felt that it is "good touch and the willingness to buy" The rating is "3" when the touch is normal and the purchase intention is not high or low, and the rating is "2" when the feeling is "poor touch and the purchase intention is low". "" When the evaluation is "1", and the average score of each evaluator is calculated as the evaluation value. Furthermore, Comparative Example 1 is a commercially available product containing four layers of pharmaceuticals, and belongs to the category of the highest-grade product with a very high market price.

[Table 1]

[Table 2]

[Test Results] Table 1 summarizes the test results obtained by changing the glycerin and 1,3-propanediol content. Table 2 summarizes the test results of the modified ratio and content of glycerol to 1,3-propanediol. In addition, the results obtained by graphing the functional evaluations in Table 1 are shown in FIG. 2, and the results obtained by graphing the functional evaluations in Table 2 are shown in FIG. 3.

As shown in Tables 1 and 2, in Comparative Example 3, Examples 1 to 5, and Comparative Example 4, the ratio of glycerol to 1,3-propanediol was fixed at 1: 0.07, but the content of glycerol and 1,3-propanediol was fixed. different. If these examples are compared, in the example of the present invention, the content is in the range of 6.1 to 12.6% by mass. Compared to Comparative Example 1 (reference product), the "softness", "smoothness" and "softness" "Is a significantly better result.

Then, as shown in Tables 2 and 3, Comparative Examples 4 to 8 and Examples 6 to 13 had different ratios and contents of glycerol to 1,3-propanediol. Comparing these examples, within the range of the content in the present invention, especially in the range of the ratio of glycerol to 1,3-propanediol in the present invention, compared to Comparative Example 1 (the reference product), "soft "Degree", "smoothness" and "softness" are significantly excellent results. In Comparative Examples 7 and 8, the content of glycerol and 1,3-propanediol differed from the ranges in the present invention. At this time, it was not possible to obtain a significantly superior evaluation compared to Comparative Example 1.

From this, it is understood that the configuration of the face paper of the present invention is considered to be significantly superior in terms of "softness", "smoothness", and "soft feeling".

FIG. 1 is a diagram for explaining a method of measuring a change in average friction coefficient (MMD). Fig. 2 is a first graph showing the results of test examples in the embodiment. Fig. 3 is a second graph showing the results of test examples in the embodiment.

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Claims (3)

A face paper, which is a four-layer paper, which is characterized in that it contains glycerol and 1,3-propanediol in an amount of 6.1% by mass or more and 12.6% by mass or less, and the ratio of glycerin to 1,3-propanediol is 1: 0.04 Above and 1: 0.18 or less; The basis weight of each layer when the product is made is 10.6g / m ² or more and 14.3g / m ² or less; the outer layer has a paper thickness of 54 μm or more and 68 μm or less, and the outer layer has an MMD of 5.4 or more and 6.5 The paper thickness of the middle layer is 60 μm or more and 81 μm or less, the MMD of the middle layer is 6.1 or more and 7.6 or less; the total thickness of the four layers is 236 μm or more and 285 μm or less; and the dry strength of the face paper in the longitudinal direction is 183 cN / 25 mm or more and 303 cN / 25 mm or less, dry strength in the lateral direction is 60 cN / 25 mm and 108 cN / 25 mm or less, and wet tensile strength in the horizontal direction / dry tensile strength in the horizontal direction is 0.38 or more and 0.72 or less. A method for manufacturing a facial tissue product, which is characterized in that a moisturizing medicinal solution is provided on the front and back sides of a laminated sheet such that glycerin and 1,3-propanediol contain 6.1% by mass or more and less than 12.6% by mass in absolute terms. The laminated sheet is formed into a four-layer structure formed by laminating an outer base paper and a middle base paper, and the dry paper force of the outer base paper in the longitudinal direction is 112cN / 25mm or more and 139cN / 25mm or less, and the dry paper force in the horizontal direction is 66cN / 25mm or more and 88cN / 25mm or less, the intermediate base paper has a dry paper force of 72cN / 25mm or more and 99cN / 25mm or less in the horizontal direction, and a dry paper force of 51cN / 25mm or more and 73cN / 25mm or less in the horizontal direction, and The ratio of the dry paper force of the middle base paper in the longitudinal direction to the dry paper force of the outer base paper in the longitudinal direction is 0.64 or more and 0.71 or less. The dry paper force of the middle base paper in the horizontal direction is relative to the dry paper force of the outer base paper in the horizontal direction. The ratio is 0.77 or more and 0.83 or less; the moisturizing medicinal solution contains glycerin and 1,3-propanediol, and the mass ratio of glycerin to 1,3-propanediol is 1: 0.04 or more and 1: 0.18 or less. The method for manufacturing a facial tissue product according to claim 2, further comprising: a first calendering step, which is performed before applying the aforementioned moisturizing liquid; and a second calendering step, which is providing the aforementioned moisturizing liquid. It is performed thereafter; and, a folding processing step is performed by a rotary interlaced folding machine.